The command username hard rtprio 99 is typically used in the context of configuring user limits in Unix-like operating systems, specifically within the /etc/security/limits.conf file or a similar configuration.
Here’s a breakdown of what it means:
username: This specifies the user for whom the limit is being set. You would replace
usernamewith the actual username of the account you want to configure.hard: This refers to a hard limit. Hard limits are those that cannot be increased by the user; they can only be changed by a superuser (root).
rtprio: This stands for “real-time priority”. It controls the real-time scheduling priority for processes started by this user.
99: This number indicates the maximum real-time priority value that can be assigned. In many systems, valid values range from 1 (lowest) to 99 (highest).
Example
If you wanted to set this for a user named john, you would write:
john hard rtprio 99
This would allow the user john to assign real-time priorities up to 99 for their processes, which can be useful for applications requiring low-latency processing.
Important Note
Modifying these settings should be done with caution as allowing users high real-time priorities can affect system performance and stability if not managed correctly. Always ensure that such configurations align with your system’s use case and resource management policies.
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